Error: failed to find element matching selector "#Instructionstab > div:nth-child(1) > div > div.buttonbardiv > ul.buttonbar > li:nth-child(1)" code example

Example: css nth-child

/* Select the first list item */
li:nth-child(1) { }
/* Select odd list items */
li:nth-child(odd) { }
/* Select even list items */
li:nth-child(even) { }
/* Select each list item every 3 (3,6,9...) */
li:nth-child(3n) { }
/* Select each list item every 3 starting from the fourth (4,7,10...) */
li:nth-child(3n+1) { }

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Css Example